Streamlining Molecular Model Presentation Attributes in SAMSON

Molecular modelers often face challenges in managing the visibility and organization of complex molecular systems. SAMSON’s presentation attributes in the Node Specification Language (NSL) offer an efficient solution to refine and control the display of molecular nodes, ensuring your models are both informative and aesthetically clear.

What are Presentation Attributes?

In SAMSON, presentation attributes are designed to control the visual representation and selection status of nodes within a molecular model. These attributes make it simpler to work with large, complex systems by filtering and fine-tuning which parts of the model are visible or selected.

The presentation attribute space, identified with the short name pr, exclusively matches presentation nodes. Some presentation attributes are inherited from the broader node attribute space, maintaining compatibility with NSL’s core functionalities.

Key Attributes to Simplify Your Workflow

Below are some useful presentation attributes that can significantly simplify your tasks:

hidden (pr.h): This attribute allows nodes to be hidden from view. By setting pr.h to true, a node’s visibility is suppressed, effectively decluttering your workspace.
name (pr.n): Assign meaningful names to nodes or use patterns to identify groups of nodes. For instance, pr.n "L*" matches all nodes with names starting with “L”.
selected (pr.selected): Manage whether a node is currently selected or not. Use expressions like pr.selected or not pr.selected for quick selections.
selectionFlag (pr.sf): Control the selection state flag of nodes, affecting grouping and filtering in downstream operations. E.g., pr.sf false deselects nodes.
visibilityFlag (pr.vf): A powerful tool to toggle node visibility while retaining data for those nodes. Expressions like pr.vf false render a node invisible while preserving its availability.
visible (pr.v): This attribute determines whether a node is actively visible. Use pr.v or not pr.v to include or exclude nodes as needed.

An Example Use Case

Imagine you’re working with a complex protein-ligand system and want to focus on the ligand while hiding unnecessary structural elements. Using NSL’s presentation attributes, you could write:

pr.h true     // Hide nodes initially
pr.n "Ligand" not pr.h // Ensure the ligand remains visible

1 2	pr.h true // Hide nodes initially pr.n "Ligand" not pr.h // Ensure the ligand remains visible

This snippet automatically makes all nodes hidden except for those whose names include “Ligand.” You can even extend this approach to selectively toggle visibility or highlight specific components for presentations, reports, or further analysis.

An Integrated Approach

By mastering presentation attributes, you’ll improve not only your workflow efficiency but also the clarity of your molecular representations. When used effectively, these attributes can make your modeling process faster, more intuitive, and better organized.

To dive deeper into the full set of presentation attributes, visit the official documentation page.

SAMSON and all SAMSON Extensions are free for non-commercial use. Get SAMSON today at www.samson-connect.net.